<template>
    <div class="login_container">
      <!-- 登录区域 -->
      <div class="login_box">
        <div class="logo_box">
          <img src="../assets/logo.png" alt="">
        </div>
        <!-- 表单区域 -->
        <el-form class="login_form" ref="loginFormRef" :model="loginForm" :rules="loginFormRules" label-width="0px">
          <!-- 用户名 -->
          <el-form-item prop="username">
            <el-input prefix-icon="el-icon-user" v-model="loginForm.username"></el-input>
          </el-form-item>
          <!-- 密码 -->
          <el-form-item prop="password">
            <el-input prefix-icon="el-icon-lock" v-model="loginForm.password" type="password"></el-input>
          </el-form-item>
          <!-- 按钮 -->
          <el-form-item class="btns">
            <el-button type="primary" @click="login">登录</el-button>
            <el-button type="info" @click="resetLoginForm">重置</el-button>
          </el-form-item>
        </el-form>
      </div>
    </div>
  </template>
  
  <script>
export default {
  data() {
    return {
      // 表单绑定的数据
      loginForm: {
        username: 'admin',
        password: '123456'
      },
      // 表单的验证规则
      loginFormRules: {
        // 用户名的验证规则
        username: [
          { required: true, message: '请输入用户名称', trigger: 'blur' },
          { min: 3, max: 5, message: '长度在 3 到 5 个字符', trigger: 'blur' }
        ],
        // 密码的验证规则
        password: [
          { required: true, message: '请输入用户密码', trigger: 'blur' },
          { min: 6, max: 16, message: '长度在 6 到 16 个字符', trigger: 'blur' }
        ]
      }
    }
  },
  methods: {
    // 重置登录表单
    resetLoginForm() {
      this.$refs.loginFormRef.resetFields()
    },
    login() {
      // 表单预验证
      this.$refs.loginFormRef.validate(async valid => {
        if (valid) {
          const { data: res } = await this.$http.post('/api/user', this.loginForm)
          if (res.meta.status === 200) {
            this.$msg.success('登录成功')
            window.sessionStorage.setItem('token', res.data.token)
            this.$router.push('/home')
          } else {
            this.$msg.error('用户名或密码输入错误')
          }
        }
      })
    }
  }
}
</script>

<style lang="less" scoped>
  .login_container {
    background-color: #2b4b6b;
    height: 100%;
  }

  // 登录部分
  .login_box {
      width: 450px;
      height: 300px;
      background-color: #fff;
      border-radius: 3px;
      position: absolute;
      left: 50%;
      top: 50%;
      transform: translate(-50%, -50%);

      // 图表盒子
      .logo_box {
        height: 130px;
        width: 130px;
        border: 1px solid #eee;
        border-radius: 50%;
        padding: 10px;
        box-shadow: 0 0 10px #ddd;
        position: absolute;
        left: 50%;
        transform: translate(-50%, -50%);
        background-color: #fff;
        img {
          width: 100%;
          height: 100%;
          border-radius: 50%;
          background-color: #eee;
        }
      }

      // 表单
      .login_form {
        position: absolute;
        bottom: 0;
        width: 100%;
        padding: 0 20px;
        box-sizing: border-box;

        // 按钮
        .btns {
          display: flex;
          justify-content: flex-end;
        }
      }
    }
</style>